Material compatibility-wise, rpsexdoll’s TPE skin or medical-grade silicone (Shore hardness 00-30) is compatible with a pH of 6.5-7.5 neutral cleaning solution (e.g., a 5% concentration baby shower gel). Experimental tests confirm that after 0.1ml cleaning fluid spraying per centimeter square area surface (25-35℃ temperature), 3-5 times microfiber cloth wiping density 180g/m² may remove 90% water-type stains (sweat, drinks), ≤0.003mm wear on skin (industry standard ≤0.01mm). It is necessary, nevertheless, to avoid solvents containing ethanol content > 30% or acetone, otherwise silica gel will be expanded (≥8% enlargement in volume).
Dirty stains (e.g., oil, cosmetics) need to be treated with isopropyl alcohol (70%±5% concentration) locally. Experimental data show that by using a cotton swab of 0.5ml solution, rub the stained part in a circular motion 20 times (applied pressure ≤0.1MPa), wait for 3 minutes, wash, 95% of the greasy residue could be removed (detection limit of GC-MS: 0.01μg/g). In a user example, lip glaze stains (like organic silicone oil) were treated by this process, the ΔE value of the color difference was reduced from 12.3 to 0.8 (to the dominant color), and it took 15 minutes and only ￥0.5 (the consumables).
Pigment penetration (red wine, ink) should use oxidation method: 3% hydrogen peroxide solution (heated to 40℃), wet non-woven material (gram weight 50g/m²), apply to the area stained and seal the plastic wrap, heat to 45℃ (the temperature control accuracy ±1℃) for 30 minutes. Analytical measurements confirm that the yield of extraction of organic dyes using this treatment is 88%, whereas the effect on tensile strength is below 2% (limiting value – 5%). Note the indication that single treatment should not exceed 1 hour, or it will enhance silica gel aging (yellow index ΔYI increases by 0.5/year).
When it comes to choice of tool, the official suggested choice is a nano-sponge of diameter not greater than 0.3mm (density 25kg/m³) and wiping using deionized water (conductivity ≤5μS/cm). The testing has shown that there is an improvement of stain removal efficiency by 40% (coefficient of friction 0.02 compared to 0.08) compared to conventional sponges without residual particles left behind (microscopical counts of residue particles > 1μm falling from 120 /cm² to 3 /cm²). However, it needs to be avoided hard objects such as steel balls (Mohs hardness 5.5), or else scratches will be produced (depth ≥0.1mm, repair fee ￥800/place).
In the aspect of preventive maintenance, regular spraying with silicone protectant (with polydimethylsiloxane content of 0.5%, volume of application of 5ml/m²) can reduce the stain adhesion rate by 70%. User data shows that the rpsexdoll costs ￥150 annually to maintain (￥600 for non-maintenance products), and skin lifespan is extended to 8 years (industry standard 5 years). A medical institution case shows that ultraviolet disinfection (wavelength 254nm, intensity 0.5mW/cm²) is used once a week, and the remaining quantity of microorganisms is squeezed from 1200CFU/cm² to < 10CFU/cm².
In worst-case situations, the coffee stain (pH 5.0) is treated with an especial enzyme cleaning (including α-amylase 0.2%) : soaked at 40℃ for 20 minutes, supplemented by ultrasonic washing (frequency 40kHz, power 50W), the color L* value is recovered to 98 (original value 100), and the cost of time is ￥25 (outsourcing professional cleaning services). But it should be noted that the drying temperature should be ≤50 ° C (silica gel glass transition temperature 60 ° C), otherwise a permanent deformation (≥5% deformation rate) will be incurred.
The experimental results reveal that by the above method, the treatment success rate of the rpsexdoll stain can be elevated to 92% (the average user independent operation is 75%) and the annual maintenance cost can be lowered by 63%. However, it must be strictly kept away from harmful chemicals such as bleach (e.g., sodium hypochlorite > 1%) and organic solvents (e.g., xylene), or it will lead to material brittleness (elongation at break decreases from 800% to 200%), and up to 35% maintenance expenses on top of the cost of the product.